Heat Controller MGD60-E3A, MGD90-E5A Return AIR Alcove Instruction, Closet Installations

MGD Series Gas Furnace

RETURN AIR

ALCOVE INSTRUCTION

The furnace may be installed free standing or in an alcove with a free flow of air back to the furnace. A minimum of 18” shall be provided at the front for return air and service access.

CLOSET INSTALLATION – 6 in.

Note: If return air is through a side wall, there must be a minimum of 6-in. clearance from side wall to furnace in addition to 6-in. minimum clearance from inside of closet door to front of furnace.

If a louvered door complying with the minimum air requirements is used, the front clearance my be reduced to 1”.

CLOSET INSTALLATIONS

Additional Requirements

Concerning under floor or ceiling return air systems, the following item (1 – 10) must be adhered to:

1.The return-air opening into the closet, regardless of location, is to be sized not less than specified on the appliance rating plate.

2.If the return-air opening is located in the floor of the closet (versus the vertical front or side wall), the opening is to be provided with means to prevent its inadvertent closure by a flat object placed over the opening.

3.The cross-sectional area of the return system (when located in the floor or ceiling of the manufactured home) leading into the closet is to be not less than that of the opening specified on the appliances rating plate.

4.The total free area of openings in the floor or ceiling registers serving the return-air duct system is to be not less than 150% of the size opening specified on the appliance rating plate. At least one such register is to be located where the likelihood of its being covered by carpeting, boxes, and other objects is minimized.

5.Materials located in the return duct system have a flame spread classification of 200 or less.

6.Non-combustible pans having one-inch upturned flanges are located beneath openings in the floor return duct system.

Installation Instructions

7.Wiring materials located in the return duct system conform to Article 300-22 (B&C) of the National Electric Code, ANSI / NFPA-70.

8.Gas piping is not run in or through the return duct system.

9.The negative pressure in the closet, as determined by test with the air-circulating fan operating at high heating speed and the closet door closed, is to be not more negative than minus 0.05-inch water column.

10.For floor return systems, the manufactured home manufacturer or installer shall affix a prominent warning where it is easily read when the closet door is open.

The marking shall read:

Heat Controller, Inc. Jackson, MI 49203 MGD Installation Instructions 4